Wrench.



N. ANDERSON.

WRENCH.

APPUICATION FILED JULY 12, 1915.

Patented Apr. 4,

MINI lll li mmmq THE COLUMBIA PLANOORAPH cu.. WASHINGTON, n. c.

T T F11? NELS ANDERSON, OF HURLEY, SOUTH DAKOTA.

WRENCH.

Specification of Letters Patent.

Patented Apr. 4:, 1916.

Application filed July 12, 1915. Serial No. 39,516.

ing certain novel features whereby the relative positions of the jawsand handle may be readily altered to facilitate application of thewrench in close quarters.

A further object of the invention is the production of a self-adjustingwrench which is stable and thoroughly dependable in operation, and thecost of production of whlch is reduced to the minimum.

l/Vith these and other objects in view,

the invention, consisting in the construction,

combination and novel arrangement of parts, will be clearly understoodfrom the following description, reference belng had to the accompanyingdrawings, which form a part of this application and in which likecharacters of reference indicate corresponding parts throughout theseveral views, of which,

Figure 1 is a side elevation of a wrench constructed in accordance withthe inven tion; Fig. 2 is a vertical section of the same, a portionbeing cut away; Fig. 3 s anelevation opposite to Fig. 1; Fig. 4 1s aplan of Fig. 3; Fig. 5 is an inverted plan of the jaws as presented inFigs. 2 and 3; Fig. 6 is a fragmentary side elevation of a modlficationof the jaws; Fig. 7 is a rear elevation of the sliding jaw; and Figs. 8and 9 are enlarged elevations of the pivot-bolts.

Although I have illustrated and hereinafter described the. preferredembodiment of the invention, I would not be understood as being limitedto the specific structure chosen for illustration, for variousalterations and modifications in the details of construction andarrangement of parts may be made without departing from the spirit andscope of the invention as defined in the appended claims.

The invention contemplates, broadly, a

wrench including companion jaws, movable toward and from each other andprovided with toothed portions. A spur-gear, or toothed-sector, isjournaled upon one jaw and engaged with the toothed portion of the otherjaw and the handle is pivoted to an eccentric portion of the sector andprovided with teeth engaged with the toothed portion of the jaw uponwhich the sector is journaled, all-of which will presently be made moreclear.

In its preferred form, the wrench includes means for readily disengagingthe toothed portions from the members with which they coact, to permitalteration of the normal mutual relation of the jaws, and the normalposition of the handle.

Referring, now, to the illustrations, 10 is the handle, the forward endof which is bifurcated and formed with segmental pinions, 11, engagedwith similar pinions, 12, formed on the bifurcated portion of a suitablehead, 13, provided with a jaw, 1d, at right-angles to which the head isformed with a straight face, 15. The straight-faced portion of the headis provided with a channel, or slot, 16, the inner portion of which isenlarged to form a guide-way, 17, which may extend entirely through thehead and the intermediate portion of which communicates with the openingintermediate the toothed-segments, 12. lVithin the guideway, 17, thehead slidably incloses a suitable rack, 18, having a web, or reducedportion, 19, freely inclosed within the channel, 16, and carryinga jaw,20, in parallelism with the companion jaw. The rack may be formed with agroove, 21, into which extends a stud, or pin, 22, in the head, and

engageable with the portion of the rack at the end of the groove toprevent outward displacement of the rack. The bifurcated portion of thehead incloses a spur-gear, or sector, 23, engaged with the rack andhaving an extended portion, 24, pivoted between and coaxially with thepinions, 11, upon a suitable pin, or bolt, 25. The sector, 23, isprovided with an eccentric circular opening, 26, inclosing a disk, 27,fixed upon a bolt, or pin, 28, protruding coaxially and freely throughthe segments, 12, and positioned eccentric to the disk and coaxiallywith the sector, 23. The pivot-bolts, 25 and 28, are interconnected onone side of the wrench by a suitable latch-plate, 29, one end of whichis fixed to the bolt, 28, and the opposite end of which is provided withan opening to inclose the bolt, 25. The latter end may also be formedwith an outwardlybent car, 30, by which the latch-plate can beconveniently sprung out of engagement with the adjacent bolt to permitthe adjustment of the toothed members, which operation will behereinafter described. On the opposite side of the wrench, the pinions,11 and 12, may be covered by a guard-plate, 31, secured at one end toone ofthe bolts and formed at the other end with a slot, 32, to slidablyinclose the other bolt and permit relative movement of the bolts towardand from each other.

.In the embodiment chosen for illustration, the portion of the shank ofthe bolt, 28, upon which the guard-plate and adjacent pinion aremounted, is cylindrical, as at 33, (Fig. 8), while the remaining portionis flat-sided, as-at 34, to coact with correspondinglyshaped openings,35, in the eccentric, 27, and latch-plate, 29, whereby relative rotationbetween the bolt and the eccentric and latch-plate is prevented. Thecorners of the fiat-sided portion of the bolt are rounded, however, asat 36, to provide a suitablejournal for the pinion 12, adjacent thelatch plate. Assuming, now, that the head of the wrench is fixed,movement of the handle toward and from the position indicated in brokenlines, in Fig. 1, causes the sector, 23 to coact with the rack toaccordingly move the jaw, 14, toward and from the position indicated inbroken lines.

It is now apparent that the wrench may be readily applied to and firmlygripped upon a nut, bolt-head, or other member; and that the firmness ofthe grip increases according as the pressure upon the handle. Should itbe desired to alter the angle of the handle, with respect to the head;or to change the normal mutual relation of the jaws, the latch-plate isfirst disengaged from the bolt, 25, and then turned laterally, thusturning the eccentric within the sector,

' whereupon the latter will be disengaged from the rack, and thepinions, l1 and 12, separated. The jaw, 14, may then be moved closer toor farther from its companion; or the handle may be moved laterally tochange its angle. Upon the latch-plates movement to its normal position,the toothed members Having thus described my inventiomwhat I claim asnew and desire to secure by Letters Patent of the United States, is,-

1. A wrench comprising companion jaws, each movable toward and from theother and having toothed parts, a toothed sector pivoted at its centerupon one of said jaws and engagedwith the toothed part of the other jaw,and a handle having a toothed part and pivoted to an eccentric part ofthe sector, the toothed part of the handle being engaged with thetoothed part of the jaw upon which the sector is pivoted.

2. A wrenchcomprising companion jaws, each movable toward and from theother and having toothed parts, a toothed sector pivoted at its centerupon one of said jaws and engaged with the toothed part of the otherjaw, a handle pivoted to an eccentric part of the sector and having atoothedpart engaged with the toothed part of the jaw;upon which thesector is pivoted, and means for, disengaging and re'c'ngaging thesector. and toothed part of the handle from and'with the parts withwhich they respectively: .coact.; 3. A wrench comprising a head. havinga toward and from said first jaw and having a rack slidably carried bythe head, a toothed sector j ournaled for rotary movement coaxially withthe segmentand engaged with the rack, and a handle pivotedupon aneccentric part of the sector and having'a toothed segment engagedwithsaidfirstsegment.s u-

the segment, a handle having a toothed segment pivoted upon the sectorand engaged with said first segment, means :for preventing relativemovement between the eccentric disk and sector, and means for turningtheeccentric within the sector.

5. A wrench comprising. a head having a jaw and a toothed segment, a!second j aw movable toward and from said firstjaw and having a rackslidably carried by the head, a toothed sector engaged with the rack andhaving an extended part and an eccentric' opening, said'openingbeingeccentric tothe axis of the'segment, an eccentric-disk' inclosedwithin said opening, a pivot-bolt ex tending freely and coaxiallythrough the segment, said disk being secured to thelbolt,

a handle having a toothed segmentpivoted to said part and engaged withsaid first segment, and a link secured to said bolt and detachablypivoted coaxially with saidsecond segment. x

6. A wrench comprising a'head having a jaw on itsforward edge, astraight-faced V v 9o. jaw and a toothed segment, a aw movable channeledportion disposed at right-angles to the jaw and having its rear edgeprovided with companion toothed segments, a rack slidably inclosedwithin the channeled portion and provided with a jaw disposed inparallelism with said first jaw, a toothed sector engaged with the rack,disposed intermediate said segments and provided with an openingeccentric to its axis and the axis of the segments, an eccentric-diskinclosed within said opening, a pivot-bolt extending coaxially with andfreely through said segments, said eccentric-disk being secured to saidbolt, a handle having a bifurcated part provided with companion toothedsegments engaged with said first segments, said sector having anextended part inclosed by said bifurcated part, a pivot-bolt extendingcoaxially with and through said second segments and said extended part,and a latch-plate secured to said first bolt and detachablysecured tosaid second bolt.

In testimony whereof I have hereunto set my hand.

NELS ANDERSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patent-a. Washington, D. 0.

